Screening or separating machine.



* T. J. STURT'EVANT.

SCREENING 0R S-EPARATING MACHINE.

APPLICATION FILED Dinan. 1916.

229,8 l 4 Patented June 12, '1917.

2 SHEETS-SHEET r.

T. 1. STURTEVANT.

SCREENING 0R SEPARATING MCHINE.

APPLICATION FIL'ED 050.30. 1916.

Patented Jun 121, 1917.

THOMAS JOSEPH STURTEVANT, OF WELLESLEY,

MASSACHUSETTS, ASSIGNOR TO STURTEVANT MILL COMPANY, A CORPORATIN 0F MAINE.

SCREENING OR SEPARATING MACHINE.

Specification of Letters atent.

lilatented June 12, 1911?.,

Application led December 30, 1916.v Serial No. 139,938.

T0 all 'io/wm t may concern.'

Be it known that Trroarns J. S'rUn'rnvANT, a citizen of the United States, residing at lllelleslemin the county of Norfolk and State of lilassachusetts, have invente-d or discovered cert-ain new and useful mprovenients in Screening or Separating Machines, of which the following is a speci- `lication, reference being had therein to the accompanying drawings.

rlhis invention relates to certain iml lnovemcnts in that class of inclined screening or separating machines shown in the biturtcvant ,Patents Nos. 1,035,262 and 1.1114161, and the invention has for its ohject to provide machines of this class which will be dust-proof and in which the screens may be percussively jarred or vihrated in such a manner as to secure an efficient screening operation,

ln the present improved machine the screens are suspended from the cover of thc screen casing and which cover is preferably elastically mounted on a cover frame; f1exible` dust-tightconnections being provided between the cover and its frame and the jarring mechanism being` entirely outside of the cover so that no parts of said jarringl mechanism need extend through the cover; thus avoiding any openings in the cover through which dust might escape, all as will hereinafter more fully appear'.

In the accoinpanying` drawings Figure 1 is a partly broken out side view of an inclined separator embodying the present invention. and Fig. 2 is a cross section of the same on line 2 2. Fig. 1. Fig. 3 is a detail plan view of the cover-frame and cover with the jarring mechanism mounted thereon. Fig. il is a detail sectional view illustrating the construction by which the cover and cover-frame are mounted. and Fig. 5 is a detail view illustrative of the jarring mechanism.

Referring to the drawings, 12 denotes the screen casing which will preferably be of sheet steel. and which ispreferably mounted in an inclined position on frame parts 13 in such a .manner that its inclination may be varied. Secured to the upper end of the screen casing 12 is a feed boX 14: within which is a rotary screw conveyer, as in the separator of tbe Sturtevant patents hereinbefore referred to, said screw conveyer loeing carried by a shaft 15 provided at one end with a driving` pulley 1G, and at its opposite end with a pulley 1T. The pulley 17 is belted to a pulley 18 on a shaft 19 having iearings in standards 2O attached to the frame 21 of a cover 22 for the said casing` 12,'said shaft 19 being provided with a pulley 23 belted to a similar pulley :24 on a second shaft 197 also having bearings in standardsQO attached tothe cover frame 21. The shafts 19 are provided with tappets 25 arranged to engage the shorter arms of bell-crank hammers 2G which strike at intervals on impact blocks Q7 resting loosely in protecting sockets 28 mounted on the cover Q2, for the purpose of percussively jarring said cover and the screen or screens connected therewith. The screeningI mem ber or members are suspended from said cover within the screen casing` by means of side plates 29 attached at their tops to said cover by means of angle bars 30. The side plates Q9 are preferably provided with inwardly extending flanges 31 afforded by angle bars attached to said cover, said [langages serving as supports for the side frame parts 32 of a coarse or scalpor screen Attached to the lower parts of said side 'plates 29 are angle bars 3ft to which is attached., in any suitable manner, the screen clothing-35 of the line wire mesh screen. Dust-tight joints between the cover 22 and the cover-frame 21 are provided by means of flexible connections 36, which may be cf strong canvas or other suitable dust-tight flexible material, so that no dust can escape at the joints between the vibrating cover and its stationary frame resting on the casing 12. The cover 22 is preferably resiliently supported from the cover-frame 21 by means of springs 37 attached to said cover, as more clearly shown in detail in F ig. 1. and bearing at their free ends on the said,cover-frame. The cover-frame is provided at its upper end with arms 38 which are jointed at 39 to similar arms l0 mounted on a iiXcd part of the casing 12, so that the said cover-frame and cover may be Iifted on the hinge afforded by the joints 39, when access to the screen or the chamber of the screen casing is desired.

From the foregoing it will be apparent that when the machine is in operation the resiliently mounted cover 22 and the screens supported therefrom will be percussively jarred, in an eilicient manner, by mechanism which is entirely outside of the screen casing which is provided with a dust-tight cover, so that dust cannot escape from the top of said screen casing when the machine is in operation.

The invention is not to be understood to be limited to the details of construction herein shown and described, as such details may be varied Widely, ivithin the province of mechanical skill, Without departing from the scope of the invention as defined by the claims hereunto appended.

Having thus described my invention claim and desire to secure by Letters Patcnt:

1. In a separator, the combination with a screen casing and a screen or screens mounted therein, of mechanism, arranged above and entirely outside of said casing, for percussively jarring said screen or screens.

Q. In a separator, the combination with an inclosing casing provided with a cover, of a screen or screens supported from said cover within said casing, and mechanism, entirely outside of said casing and above said cover, for percussively jarring said screen or screens.

3. In a separator, the combination with an .inclosing casing provided with a hinged cover, of a screen or screens supported from said cover Within said casing, and mechanism, entirely outside of said casing and above said cover, for percussively jarring said screen or screens.

4. In a separator, the combination ivith an inclosing casing provided with a cover, of a screen or screens supported by said cover Within said casing, a cover-frame adapted to rest on said casing and having flexible dust-tight connections with said cover, and mechanism for percussively jarring said cover.

5. In a separator, the combination with an inclosing casing provided With a hinged cover, of a screen or screens supported by said cover Within said casing, a cover-frame adapted to rest on said easing and havingflexible dust-tight connections with said cover, and mechanism for percussively jarring said cover.

6. In a separator, the combination ivitli an inclosing casing provided with a cover, of a screen or screens supported by said cover ivithin said casing, a cover-frame adapted to rest on said casing and having flexible dust-tight connections with said cover,

means for resilicntly supporting said cover on said frame, and mechanism for percussively jarring said cover.

7. In a separa-tor, the combination With a casing provided with a cover, a cover-frame from which said cover is resiliently supported, dust-tight flexible connections between said cover and frame, a screen or screens suspended from said cover Within said casing, impact devices mounted on said cover, and means, acting on said impact devices, for percussively jarring said screen or screens.

8. In a separator, the combination With a casing, of a screen or screens yieldingly supported Within said casing, and means, entirely outside of said casing, for percussively jarring said screen or screens through an imperforate part.

9. In a separator, the combination with a casing provided With a cover, of a screen or screens yieldingly suspended from said cover within said casing, protecting sockets mounted on said cover, impact blocks in said sockets, hammers for percussively acting on Said impact blocks, and rotating shafts provided with means for lifting said'hammers at intervals.

10. In a separator, the combination with a casing provided with a hinged cover, of a screen or screens yieldingly suspended from said cover Within said casing, protecting sockets mounted on said cover, impact blocks in said sockets, hammers for percussively acting on said impact blocks, and rotating shafts provided With means for lifting said hammers at intervals.

11. In a separator, the combination With a casing, of a cover-frame adapted to rest on said casing, a cover resiliently supported from said frame, impact devices supported by said cover, standards supported by said cover-frame, hammers for percussively acting on said impact devices, and rotating shafts supported by said standards and provided with means for lifting said hammers at intervals.

12. In a separator, the combination with a casing, of a cover-frame adapted to rest on said casing, a cover resiliently supported from said frame, and having dust-tight flexible connections therewith, impact devices supported by said cover, standards supported by said cover-frame, hammers for percussively acting on said impact devices, and rotating shafts supported by said standards and provided with means for lifting said hammers at intervals.

In testimony whereof I afliX my signature.

THOMAS JOSEPH STURTEVANT.

Copies of this patent may be obtained for ve cents each, by addressing the Commissioner of Patents, Washington, D. C, 

